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Lean Body Mass Calculator

Calculate fat mass and lean mass from body weight and an entered body-fat estimate.

How It Works

Fat mass=body weight×body-fat fraction. Lean mass=body weight−fat mass. Accuracy depends on your entered body-fat measurement.

FAQs

How does this calculator work?

Fat mass=body weight×body-fat fraction. Lean mass=body weight−fat mass. Accuracy depends on your entered body-fat measurement.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.